Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e06cc81393a79744674b4d39c6faefc4291b353edf9bcd39fb9c5b6f2d32a6f' 
  AND token = 'yLrGPrPfXjrV4cyBNuy31D+yrKujy1ruBWNoUYvFZus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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