Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ba886fe7ed05e67527680da1d19e3eff0c52c5eebcb8ada7e293f9b825ea79' 
  AND token = 'PnMbO+obpiR746qr1RbgDLuCSnxn5R3LNf7bOMQdj/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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