Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5fd2ed52a1b40f719b1b2798bacb335408e42195d8d7742844cb7424c71cb0' 
  AND token = '5zHRRfPv8/OTBNZ0RZDI8byDcznzLhQssClC7ILvI9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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