Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed7b2de5c4871a6546a87c4ce9d3e54c0bbaa674ca31d9b63546859389b0ef2' 
  AND token = 'cnrb90B+B/JUnw/JdV6CrbhuoOyB98VmPyvy/J3e7Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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