Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f4aadc9a0cf46ac1be1c95a60f20c02c00d664bd71067b8e2ae0df4aa31478' 
  AND token = '66VWCvNWE9nrlV3JRaUb1gkRxw5eWU/sJDs3cLgdvaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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