Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15352fcb384578a792d1f86bc12a097cda5ebbc8316f284709696152626b84c9' 
  AND token = '2KfaWDDO2//CHFl0pzfhdFYHg+tbzYcrzef4yxEGCTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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