Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625e488ba381e098ff08e7dd5498c6cf6bad72e07bb0d1e390ccb0fe4a4fc8b0' 
  AND token = 'pvW8BYAg6hTKVoHMPsEgoWywCDphLRxRCL7agozGy1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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