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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3f17652e2c96f396346edc007566f799b5005a883c8f0b89069cd289104be5ce' 
  AND token = 'uERGEO1hWodDG1uwn95nLmiwuRMRYNTzEJFqryUz9fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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