Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c406c31ef73d1325564b69ce4ddd1641433af1048c010256a5ceddcfbfb12cda' 
  AND token = '18f0ssravf0x7sSocc9nH5jagqJ3PUgpXbNmslNmsp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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