Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decce0534eadffb29596b3b64be448b85adb0023bc7edcd5d7fafc90783f791d' 
  AND token = 'j0OXjSR5JrNFXgQdINcxKnD7jTIZHCR925zLPcEuydM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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