Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4db87a2c37a48e3c3e3d2ee68a8d7aba3a5bde31e9568a66af53dcd80a17969' 
  AND token = '6h8PFP1e42RatPtxGGA+/15s8zcnmFKxO9M6avhrO78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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