Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ff08f928f1f4dbb9ccad32d8e52754e662689e8aacd170b2c2611f1d94af43' 
  AND token = '20rP+1w+NSOOhL9znBwg2BzP69qURAJOoyY6utqH7ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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