Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c7e66150cbe5c1713a180ee6bb7267645e41c1a70f6acec3937d3940a1ee18' 
  AND token = 'eAvoxhjp2S4iP4Ftltxr2d1SNc5UTt9zLaJQgGvVs8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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