Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af786c43497f010d6bd2c86f14c7dcd8c59c039d0eccf0b77de8410ed35f7bac' 
  AND token = 'NMdhXQGr66o4VXVSeguuUmfR871KaElAz5Z1rxjfkJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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