SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '80c00da8454536270c83b5f07e8ac507bef2b9559a084708aeb47925a118268d' 
  AND token = 'RpH6JE8Waw8TlFMV/UwQdzwzeg4YmCJXjAc8ljDTt1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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