Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b4a406c0edb93e213dc749d81bcd18e4f5d794121bc78ae6cf15d5c41b19d9' 
  AND token = 'o3YNEeOWr/M/7tOMg5cufSbEsQ9ROU+oSCzx0L2v6wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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