Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6856fc8846b494339f099f7512289512fb30cefbb0e84c4cee2a7628f4a60a93' 
  AND token = 'C0KL//SbwF9/o6iibdrRHMxRr7Y55JSQ7TaCHPBMs0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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