Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4e0e0f1bcb7d7b2d84f5e3eef1ed85a0ca34e1eb304635f2059d08b07e034c' 
  AND token = '5uRVYRq6Dz/66p+pk1iasovhKP194R+IgGpJRTnogWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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