Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d270b642950c8e7d3dee496c6b1787aa4d72f3678437159446f092076d18bd' 
  AND token = '2U9W2fQD1on9sCZ/OUMVsI74K6WIovtlP0DeVnzdTYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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