SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '58bf9819f943c7408b75c4c1a29d7a29b89c68bc023440960b9a5819db3e343c' 
  AND token = '0G5Tjfa3/5k5nXvOid3YvtTkfFBhOgLOXuGWuOMVUuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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