Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5d776d76d413ebf2aff058f2c42ac56fb27941439e4ae7070f894932f6a568' 
  AND token = 'aSo/JKhK7ZA+ceqD6t7I0codyVU8U0f/T+zn1iAUM20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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