Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4218f3fe0a006606b0362e9621ce2c12143f0ad28e249214707744f84ad6a8ca' 
  AND token = 'LTfBd5pDdI/V7tlCSPZ3ptuk859PONqTlsDrCTdRH5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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