Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7f02fc0b19232de2c2f250e1da44e675f872c860a81ef8cb8aed3877d1e5ce' 
  AND token = '9U+t0kBFw8+8BB5ZzTjv95LTysVA3DuAHa51Ql1a6WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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