Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d21b2827886bbf5cce950d4417824fb4f0b3ed8594c308bbbb9d4e262120a9b' 
  AND token = '9s0wMPbMDuZn+AGt2TLBNfUEM9Zan43abDpzvmnc1J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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