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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8e3bc756f16172be4dd41bf6a42799713aa791dbfdd398190e62a07cad9ac4c3' 
  AND token = 'YPaef0V+GJ+Tbiyl4jk7U5ZDZwORILSI621fIyIU4g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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