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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4daa574a312937709e36b859d730b105815c80174d360f19dfb465ab7297b2b3' 
  AND token = 'TK6FQ9EdUApuMAEMfAj5+9Mp0WcbeRX1ZODzDXqIr3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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