Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9db1b72f344114b50797e4eeab619f8cec8265411f953d1de5fc8ccf2e022e4' 
  AND token = 'r9YPPwyz9K5U6AM/ZUi/nqBiDvkfLSF1Q4z3Bu4nRRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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