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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94624332f2c1485c881815964b9a3f82fcd92215d86622ff4c6122d8d35b6e82' 
  AND token = 'VpXEMlSB9KkLlqgsySpTBfmIgl9/B59jUNg5jG0X2lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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