SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '942fb8915e3754a91803153f75ffb7cc342337597fa01066efd9eb3e695a6ac0' 
  AND token = 'TPRNvAaIJ+bgIDl1DUJL0XsuPUuH32Kz+n4Qq+w0ijM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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