SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd748fed025f3aa4111cd2afd7ae799439259419b94e794d176c8a61326417b3' 
  AND token = 'EoL9Z9/mtr1gkzi20YHGMHW/rBZOXxuRfsWp8ZPV0w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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