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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f807de223ecefe8390612eb3a0c87259bff6aa27a7f944ec1e4374b21e8be3c0' 
  AND token = 'SMN7nKOqOLMVYqFh9TeSn56+L46IPAYFwR3CdR9/5PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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