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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0caf61bbfaaaef661c6ff6d21be69d5b4a763f73f956e5b717b6185e6c252d17' 
  AND token = '5MKGe0YpUC4wKf97TpSnYLKh0fmsFXhizzqsVeh7tGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}