Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb79fba8f24750726ce8c16251737163737421d07fff029f60c3105b6bad547b' 
  AND token = 'jcsF5ChFzFS0Tinly+LFlLSCfk/J/xF4NkV7qYJ3NK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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