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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e4ed6214288cd2a60eeb371aaa499cca04a7a0f0de84a3e473fe38d9dbe89205' 
  AND token = '5+xZcAzUuNg78/d6bwm+z/Q911RecJNXxwYap9H9f54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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