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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '865a550492c48100c1458fb5986f63ed4d06f1d8dd464143e9255d17406b8fc7' 
  AND token = 'ii8SdjIGwto1C7lf+43ORqUO/Jp2bH+d2n52ITOYA8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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