Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a55fad2e61ccd6b0032f4e6121af0078f026a5cf78d40a29ce310dbffa379f' 
  AND token = '+k36pPmzTYY7J/on/6LMizoXevRVV/kuLGsVN4QEgOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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