Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510b9ab0eefcfbc00859d4ac312f553b88bff899cabf480670f9b4f0a1aa9cc0' 
  AND token = 'zLB+IMFmwHOqWZAeMYTMBph3s7osKBIPEKwRA5KEsyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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