Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e96103082376dc1b731522b6308ef5ed494bb34555aa4434dd068969f8a17b8' 
  AND token = 'mrrQaJAz9rdgP1+bIhdk9MGJ5mDvSKrzaqdaT8+N238=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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