Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f89e880561e057f919b54bc9e314391c52798791927a78e85caa86a37f21d4' 
  AND token = 'MYGrxBiatVKv66+WWuskwD2zSX2VcObfIXY9EvAebis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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