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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b130570714b9eeedb8492a19ec760cce58f0808baed1a212454447ca000b2e5a' 
  AND token = 'HHTW0f3Gt6I0Tirz3TcMr/xw+b1Z4XDzqkjE4ernw3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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