SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9b37c1b3a29e0d0734e83fd85b1fc3cd6225d86ffc9e82367bf79a04623b6da7' 
  AND token = 'zkbLa4sejmNUIC35VJHmyral1PPFjIYvME9pOBR0x48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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