Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd404eb4ddcb441ae88c2a9832e6e5b35357d8d930856e64fec7479767a6c4609' 
  AND token = 'ZZz3qMaFFLXluA498VU5YvhQ9jQ78D6m0qQvZWHqQPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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