Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947c3757c419667c5c991da7cd4565b92646201d702b1c3919d2f82081dd63be' 
  AND token = 'dVc63Xp5DQf1i2+bzViwT+4QMh9R1fEVKafMUjL+ymQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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