Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87dc7cd3b9c35892e0826cb45cadc21debb05f3491bc108ee2ae07f11666b38' 
  AND token = '1Eq3Pe2X/uRBRFd9Orv16FQqiDQCPav3aCbh7xgoNdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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