Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99d403c5970edeb435c7f3e56a1ec08a924485b61c86df54c88317af4912988' 
  AND token = 'tuRaUxUIAly5ZinePtyIm8E6bsR6e0RooYHoD5j86sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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