Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c43a3893a9cbc87aa061046ba8ab29afcf91a707e89d3eda52c549e51a7b352' 
  AND token = 'oNeIPvYqwwJ8fWLEpLtDPea4gd/xe53dPGiAnQRgFSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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