Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d736e618e2262bff55abdab7f34a834378cc0d64b981e6efff2152735f08487' 
  AND token = 'bCXXjOmT65Xo8El7zNMHdOdjyP0pt+D+/9n4BtzgcbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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