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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b72eb9df87fb7523c90d47e03b2bbcf764ae57565c004dd5e2308b7a273d894b' 
  AND token = 'QRFirP/gvTBx2qB9yXdqbpNb2g7PslXTpH5ZQiysOJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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