Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2797ebe3b24491382471041b2fead3942c1dab092f2681ccdc1a99640382be' 
  AND token = 'jY3UItKRsEf365KpvXiibvJPRuhFhua1lCtAf5WBm+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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