Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16392cc9f5cbe54f8d69dd93825770e7e8eb59f2ffcad2ff4d39cf4978232e34' 
  AND token = 'dG3Jqu4ggbbwdWdbUpe/tyTAQu83VjqptYApBD5x/hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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