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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '66a46b68e2f3526893ed063317d64b77872979c07461dedca1e16974983b6a52' 
  AND token = '1ve4nHQn2lN3u9AIL4JKdd73EwRJVqFcmIvmuhFXw1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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