Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8fb6528b96fd20b8452a261f7c6ecd486fee8369091229859a0b69859c7d2a' 
  AND token = 'CKpYzu0lhX3KSCdFzSOSqjKz+B20RJxcsPmU88dPOyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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