Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e97fb86889ff6522785aa3b1ea321cff1f253b7ddac3138e8f7b1c465e0015' 
  AND token = 'QabEcNn1AwbzvZMdQ9qTrQCTwTEieVQ3jQYxZOfSweM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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