Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3ba63c224e239a3710619bf097ddeb681a9a2c89c45d06a26ced12a82a8d76cf' 
  AND token = 'EXnTlsSYsIa62s/Duw0G+sSI0Ob1sjpurur9LRDX0Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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