Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1318ede3ccfaab8267de8fd4903d3573a24615df183a089f62aa3e8012b8bf10' 
  AND token = 'hOj74wh6+AJhRhIP2NZVsfGBTUgC82sGgEEM3mLS0uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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