Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9544b93bc9f4cebb1a9b630c962ebf639d4e253e6f23d9e86011c2248ec02f1' 
  AND token = 'RKuwvTc2NYeMtNOksaF8PA/yZyScxq4092Yo4op214w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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