Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d0cabff3dd784d6d78a4b740c99f53d9dfe4236833efa5564757990979c331' 
  AND token = 'gTSK90hcGn5oR/YxWwJYr77iGWuZqBYxDu/s7wygxrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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