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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eda41edcfba1d475f5ea65e9750176878f37f0cea8684ad9aadd2cae609c824d' 
  AND token = 'RAuKKj0TiNXydQH7dWOk+4pkMJQ0de2NZ2MdDYhgPSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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