Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36c5c5eb5cd4a78e0705d82d2796f485a938b56c59d9f13af4f3b24a22b43cc' 
  AND token = 'wLs2PqTXnC88MrpwBjzV6og64T1fS6ov9t4Fmn9AkVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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