Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0cc070d7cadfcb840b55d08465396efe4186682c52962062b722dbd619df58' 
  AND token = 'qGQCb2+8CIQ87aGArirc6q9f4CJoojj1c5ILWvpNPMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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