Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4589d385c1236ef10d1abc7fa8421b20c590144c755120f7a0b3de64ad2a99' 
  AND token = 'Q6EZzMhl8sVkNSWwpg0IUqsW2suBxhMWDSSVIlVI/cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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