Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7df38814f81886e145ad992525bd64c53f25b29e94be55f22329d86fff7ed54' 
  AND token = 'mJx40038pzeP27TdlHMdTUj9x8gTkNpQuxs4Aj5LUGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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