Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82eb4971812929321f2b914d16b390a9bcba5b4bf7e2e5664cae664fc82bbb1f' 
  AND token = '6DIOF8IdF8EyM3ZPrdEgRwt55fAUyVFp9P6aDwI2qE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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