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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79cfa2aba55a95a6d9920bfa0ca5e71335bcd9cbb09b5fea29016d579a04ad8b' 
  AND token = 'xiL13avnQ0pkudMXuW+4qmDy2+dexoz9s6C9FEflnn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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