Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0d500378b8424205b2a3967a20c90bcee558b7a6958a26251264a5e0dc1e893c' 
  AND token = 'lKsbKPsJysdPGlY/hXl0aNNfHiqKBfF3Mm/0Yhdg1Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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